Ricoh FT5034C Service Manual page 253

6.2.2 Original Separation
The feed roller and the friction belt separater the originals. The friction pad prevents
the uppermost original from being fed in.
Friction Belt
Registration
Sensor
Registration
Roller
µ
1: Friction coefficient between feed roller and original
µ
2: Friction coefficient between friction belt and original
µ
3: Friction coefficient between original sheets.
µ µ µ
1 > 2 > 3
6.2.3 Original Feed-in Mechanism
The bottom original separated by the friction belt is fed to the registration rollers. The
registration rollers feed the original to the transport belt, then the original passes the
registration sensor.
The ADF determines original size through the use of the registration sensor.
The original's length is calculated by counting the number of pulses while the
registration sensor is on.
Original size detection is necessary for the ADF's feed-in/feed-out timing.
Original Set Sensor
Feed Roller
Left Scale
- 10 -
Friction Pad
Spring Plate
Pick-up Roller Position
Sensor
Transport Belt
Pick-up Roller